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What is Process Control Block ? Today in this Computer Science Study Material for Gate we will discuss about process control block and its various field which provides the information about process. .So let see what is process control block. A Process Control Block is a data structure maintained by the Operating System for every process. Each process has it own data structure. When a process is created then a unique id is assigned to the process Operating system identify a process among all processes on the basis of this process id. A PCB keeps all the information needed to keep track of a process. Generally a process control block contains the following information about a process. To read full tutorial click on the given link http://www.computersciencejunction.in/2018/02/introduction-to-process-control-block-in-operating-system.html

TCP/IP protocol based questions for gate computer science exam Q1.What is the difference between transport and session layer of OSI model. Answer: OSI Model Transport Layer The transport layer uses the services provided by the network layer, such as best path selection and logical addressing, to provide end-to-end communication between source and destination. • The transport -layer data stream is a logical connection between the endpoints of a network. • End-to-end control is provided by sliding windows and reliability in sequencing numbers and acknowledgments. The transport layer regulates information flow to ensure end-to-end connectivity between host applications reliably and accurately. • The TCP/ IP protocol of Layer 4 (t transport t layer ) has two protocols. They are TCP and UDP. The transport layer accepts data from the session layer and segments the data for transport across the network. Generally, the transport layer is responsible for making sure that the data is delivered error-free and in the proper sequence. Flow control generally occurs at the transport layer. OSI Model Session Layer The session layer establishes, manages, and terminates communication sessions. Communication sessions consist of service requests and service responses that occur between applications located on different network devices. These requests and responses are coordinated by protocols implemented at the session layer. The session layer establishes, manages, and terminates sessions between applications Functions of the session layer and the different processes that occur as data packets travel through this layer. More specifically, you learned that Communication sessions consist of mini-conversations that occur between applications located on different network devices. Requests and responses are coordinated by protocols implemented at the session layer. • The session layer decides whether to use two-way simultaneous communication or two-way alternate communicati